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(NO Model.) 3 Sheets-Sheet 1.

L. B. 85 G. W. ATKINSON & W. T. G OOLDEN. MACHINERY FOR CUTTING GOAL AND OTHER MINERALS.

No. 476,593 a, ted June 7, 1892.

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(No Model.) 3Sbeets-Sheet 2. L. B. 8: G. W. ATKINSON & W. T. GOOLDEN. MACHINERY FOR CUTTING GOAL AND OTHER MINERALS.

No. 476,593. Patented June '7, 1892.

fnveniars:

(No Model.) I 3 Sheets-Sheet 3.

L. B. & 0. W. ATKINSON & W. T. GOOLDEN. MACHINERY FOR CUTTING GOAL AND OTHER MINERALS.

No. 476,593. Patented June 7, 1892.

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UNITED STATES PATENT OFFICE.

LLE'WELYN B. ATKINSON, CLAUDE TV. ATKINSON, AND YVALTER T. GOOLDEN, OF LONDON, ENGLAND.

MACHINERY FOR CUTTING COAL AND OTHER MlNERALS.

SPECIFICATION :orming part of Letters Patent No. 476,593, dated June '7, 1892.

Application filed August 18, 1891- Serial No. 403,066. (No model.) Patented in England September 6,1889,No. 14,041.

To a whom, it may concern.-

Be it known that we, LLEWELYN BIROHALL ATKINSON, CLAUDE WILLIAM ATKINSON, and WALTER THOMAS GOOLDEN, residing at London, England,haveinvented an Improvement in Machines for Cutting Coal and other Minerals, (which has been patented to usin Great Britain under N0. 14;,041 and dated the 6th of September, 1889,) of which the following is a specification.

This invention has for its object the improvement of machinery for cutting coal or other minerals by electric power by providing a compact combination of electric motor and r5 coal-cutting machine in which the magnetic frame-work of the motor and the framing of the machine are combined.

Figure 1 is an end elevation, and Fig. 2 a side elevation, of our improved machine. Fig. 3 shows modified chain-gear. Fig. 4 cmbraces a longitudinal section and a plan of the switch. Fig. 5 is a diagrammatical view ofthe circuits. Fig. (3 isa vertical transverse section on axis of shaftf.

The machine is mounted on a base a, carried on wheels with double or single flanges to work on the rails of the mine or pit. In the center of this base is a circularcavityhaving a central pin, on which is secured by guides the circular base of the machine, so that the machine can rotate on the said pin and circular base. The whole machine, consistin g of the motor, gearing, and cutter-shaft, can be rotated by means of the worm and worm-segment c and (Z.

Figs. 1 and 2 show the arrangement where a horizontal doublefield motor is used. By double-field motor is meant a motor in which the single field is duplicated or concentrated by double windings, as compared with a single-field motor produced by a single winding only. Here the block 6, which is in one casting with the circular base, forms the support for the bearings of the shaft which carries the cutter f, the shaft passing right through the block, which also forms the bottom pole-piece of the motor. The extensions of this block in front and behind carry the bearings of the armature-shaft, which is parallel to the lower or cutter shaft and gears with it by means of the wheels g h, which are preferably double helical-teeth wheels. The casingj, preferably of non-magnetic metal, covers in the wheels to prevent the access of dirt. The armature is inclosed by the side plates 1; 7i: and the front end cover Z and back covers m, which are removable, these covers being attached by bolts, making practically air-tight joints to exclude dirt and to provide against danger from explosive gases. The magnetiz ingcoils are wound on wrought-iron cores and the top pole-piece 0 completes the frame of themotor. The magnet-coils arcinclosed in a sheet steel or copper lagging to protect the wire from mechanical injury.

Fig. 3 shows the modified arrangement where the motor is of the inverted vertical type and shows an arrangement of chain-gear which maybe adopted instead of wheel-gearing. The coverings and general arrange- 7o ment are in this case similar to those already described.

The electric motor is started and stopped by the switch, constructed as follows: On an insulating base bolted ,to the machine is mounted a switch, Fig. 4, with four or more 7 consecutive contacts a a aa and one isolated contact h. Round the switch proper is an insulated metal cylinder,on which a resistancewire is wound and connected at intervals to the points of the switch. The whole is inclosed in a metal casing cl, practicallyair and gas tight.

Fig. 5 shows, diagrammatically, the arrangement of the switch and its connections to the motors shown in Figs. 1, 2, and 3, the switch in the latter case being preferably attached to the back of the pole-piece.

The action is as follows: On making the circuit the switch-bar passes over the various 0 points of the switch, and thereby short-circuits the resistance gradually, allowing the machine to start steadily. On moving the switch to stop the motor the resistance is gradually inserted, and, finally, at the moment of breaking, by means of the isolatedpoint of contact I) the magnet-coils are short-circuited, thus diminishing the spark very considerably.

Having now particularly described and ascertained the nature of our said invention I00 and in what manner it is to be performed, we declare that what we claim is- In a machine for cutting coal or other minerals, the combination of a magnetic polea cutter-bar mounted on the said conntershaft, substantially as set forth.

In testimony whereof We have signed our names to this specification in the presence of 15 electro-magnets and adapted to form in one casting a circular base to the motor for swivcling upon a traveling carriage and also adapted for the bearings of the revolving ar- IO mature-shaft and of an under counter-shaft, geared together by cog-wl1eels and chain, with LLEWELYN B. ATKINSON. CLAUDE XV. ATKINSON. WALTER T. GOOLDEN. /Vitnessesz ToM. M. TULEY, CHARLES C. F. ARRoWsMITH.

5 piece or yoke connecting the like poles of two two subscribing Witnesses. 

